ML20207G515

Summary of 990422 Meeting with Ue & NRC Staff Re Electrosleeved Repaired SG Tubes During Beyond Design Basis Accidents.List of Meeting Attendees,Nrc Staff Meeting Presentation Matls & Ue Meeting Presentation Matls Encl

ML20207G515
Person / Time
Site:	Callaway
Issue date:	06/08/1999
From:	Mel Gray NRC (Affiliation Not Assigned)
To:	NRC (Affiliation Not Assigned)
References
TAC-MA3954, NUDOCS 9906110190
Download: ML20207G515 (20)

Text

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• o'4 UNITED STATES E 3 NUCLEAR REGULATORY COMMISSION

_% I WASHINGTON, D.C. 30006 0001 g June 8,1999 LICENSEE: Union Electric Company FACILITY: Callaway Plant, Unit 1

SUBJECT:

MEETING WITH UNION ELECTRIC COMPANY REGARDING THE PROPOSED AMENDMENT TO ALLOW THE INSTALLATION OF {

s ELECTROSLEEVES IN THE STEAM GENERATORS AT THE CALLAWAY PLANT, UNIT 1 (1 AC NO. MA3954) ,

I I

On Thursday,' April 22,1999, a meeting was held between Union Electric Company (UE) and {

the Nuclear Regulatory Commission (NRC) staff to discuss issues regarding Electrosleeved l repaired steam generator tubes during beyond design basis severe accidents. UE submitted an amendment application that requested approval of the Electrosleeve steam generator tube repair method for Callaway Plant, Unit 1. Enclosure 1 is a list of attendees. Enclosures 2 and 4 are the NRC staff's presentation material used during the meeting. Enclosure 3 is the licensee's presentation material used during the meeting.

The staff began the meeting with a presentation of the materialin Enclosure 2. The staff indicated that while Electrosleeves meet current regulatory requirements, there is a concem regarding their performance during beyond-design-basis severe accident conditians. The staff presented preliminary technical results and discussed the information that was used in arriving at these preliminary results. The staff indicated that the preliminary results may indicate the need for a flaw length limitation in the amendment application.

UE then presented the results of the Callaway Plant risk evaluation (see Enclosure 3). UE and the staff discussed actions in the severe accident management guidelines and emergency operating procedures that could decrease the probability of high primary side pressure /

depressurized secondary side severe accident conditions. With regard to the use of fire system water, the staff expressed concems regarding the timing and capability to inject fire water into 4 four steam generator secondary sides, and crediting this action in the risk evaluation.

i

' The moming meeting concluded with the staff presenting one example of conceptual wording for a flaw length limit that could be used, if deemed necessary by the staff. The example is included in Enclosure 4. UE and Frematome Technologies, Inc. (FTI) attendees expressed concems with implementing a flaw length limitation. UE plans to use eddy current examination of the tube to identify a flaw and the need for an Electrosleeve repair. UE then plans to use ultrasonic (UT) examination post-installation to verify the sleeve installation meets j programmatic requirements. However, since UT is more sensitive than eddy current f examination, the post-installation UT results may show scratches that were not indicated by

- eddy current examination before sleeve installation. Due to UT depth sizing qualification still in [

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• progress, UE may not be able to distinguish a scratch greater than 1" long from the flaw identified by eddy current testing. The staff indicated that they were open to considering alternatives to the flaw length limit that UE may propose.

- The meeting continued in the afternoon with breakout sessions regarding risk information and .

material behavior of Electrosleeves during high temperature severe accident conditions.

. At the conclusion of the meeting, the NRC staff indicated that based on the information to date, they were still considering the need for a flaw length limitation. UE expressed concerns with the basis for this proposed limitation and implementation issues. UE indicated that implementation issues with the proposed flaw length limit may make the amendment impractical to implement.

These issues will be the topic of further discussion between the staff and UE personnel.

/s/

Mel Gray, Project Manager, Section 2 Project Directorate IV & Decommissioning i Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-483

Enclosures:

1. List of Meeting Attendees

. 2. NRC Staff Presentation Material

3. UE Presentation Material

4. NRC Staff Example of Proposed Wording for Flaw Length Limitation cc w/atts: See next page DISTRIBUTION Hard Coov w/all enclosures E-Mail w/ enclosure 1

Docket File JZwolinski/SBlack SLong

' PUBLIC SRichards EMurphy

' PDIV-2 Reading EPeyton JMuscara MGray . RBarrett GParry OGC ' CBeardslee - PRush ACRS -

FEltawila JStrosnider EHackett LCTinkler GHolahan DLange DGraves, RGN-IV OFFICE PDIV-2/PNL PDIV-2/LA PDIV-2/SC ,

NAME NGb EOeN SDemb N DATE C /M /99 6 / 4 /99 (9 /

OFFICIAL RECORD COPY . , _

DOCUMENT NAME: G:\PDIV-2\Callaway\MTS3954.wpd- J s--

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. progress, UE may not be able to distinguish a scratch greater than 1" long from the flew identified by oddy current testing. The staff indicated that they were open to considering altamatives to the flaw length limit that UE may propose.

The meeting continued in the aftemoon with breakout sessions regarding risk information and material behavior of Electrosleeves during high temperature severe accident conditions.

At the conclusion of the meeting, the NRC staff indicated that based on the information to date, they were still considering the need for a flaw length limitation. UE expressed concems with the basis for this pmrosed limitation and implementation issues. UE indicated that implementation issues with the proposed flaw length limit may make the amendment impractical to implement.

These issues will be the topic of further discussion between the staff and UE personnel.

f1 Mel Gray, Project Manager, Section 2 Project Directorate IV & Decommissioning Division of Licensing Project Management ,

Office of Nuclear Reactor Regulation I Docket No. 50-483

Enclosures:

1. List of Meeting Attendees i I

2. NRC Staff Presentation Material

3. UE Presentation Material

4. NRC Staff Example of Proposed Wording for Flaw Length Limitation i

ec w/atts: See next page I l

l l

i I

I l

l l

1

L Callaway Plant, Unit 1 cc:

Professional Nuclear Mr. Otto L. Maynard Consulting, Inc. President and Chief Executive Officer 19041 Raines Drive Wolf Creek Nuclear Operating Corporation '

Derwood, Maryland 20855 Post Office Box 411 i

, Burlington, Kansas 66839 John O'Neill, Esq. ,

Shaw, Pittman, Potts & Trowbridge Mr. Dan 1. Bolef, President 2300 N. Street, N.W. - {

Kay Drey, Representative i Washington, D.C. 20037 Board of Directors Coalition I for the Environment i Mr. H. D. Bono 6267 Delmar Boulevard Supervising Engineer University City, Missouri 63130

)

l Quality Assurance Regulatory Support  !

Union Electric Company Mr. Lee Fritz Post Office Box 620 Presiding Commissioner Fulton, Missouri 65251 Callaway County Court House 10 East Fifth Street U.S. Nuclear Regulatory Commission Fulton, Missouri 65151 Resident inspector Office 8201 NRC Road Mr. Alan C. Passwater, Manager Steedman, Missouri 65077-1302 Licensing and Fuels Union Electric Company Mr. J. V. Laux, Manager Post Office Box 66149 Quality Assurance St. Louis, Missouri 63166-6149 Union Electric Company Post Office Box 620 Mr. Garry L. Randolph Fulton, Missouri 65251 Vice President and Chief Nuclear Officer Union Electric Company Manager- Electric Department Post Office Box 620 Missouri Public Service Commission Fulton, MO 65251 301 W. High Post Office Box 360 Jefferson City, Missouri 65102 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower & Pavilion 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Mr. Ronald A. Kucera, Deputy Director Department of Natural Resources P.O. Box 176 Jefferson City, Missouri 65102

MEETING WITH UNION ELECTRIC COMPANY LIST OF MEETING ATTENDEES APRIL 22.1999 UNION ELECTRIC COMPANY K. Connelly T. Herrmann A. Passwater NBC R. Barrett C. Beardslee S. Dembek F. Eltawlia M. Gray E. Hackett  !

G. Holahan j S. Lors 1 E. Murphy J. Muscara ,

G. Parry P. Rush J. Strosnider C. Tinkler EPAMATOME TECHNOLOGIES. INC. (Contractor to Union Electric Comoany)

J. Galford R.Pugh M. Schoppman J. Wyatt C. Woody OTHER

. I W. Barber (McGraw-Hill)

J. Bastin (Westinghoum Electric Corporation)

L. Collins (Combustion Engineering)

G. Kammerdeiner (Duquesne Light) i ENCLOSURE 1 l

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1 Electrosleeve Flaw Length Limit Circumferential flaws i

I e No limit on the circumferential extent Axial flaws e Tubes with unconfined (freespan) parent tube axial flaws I may be electrosleeved and left in-service if engineering analysis indicates the flaws are not projected to exceed i 1-inch in length prior to the next inspection.

• Parameters such as NDE crack length measurement I uncertainty and crack growth rate should be considered in the engineering analysis ENCLOSURE 4

-. - - . . - .